Watchmaker&#39;s tool.



No. 788,881. PATENTED MAY 2, 1905. G. W. BOWERS.

WATCHMAKBR'S TOOL.

APPLIUATION FILED IEB. 8,1905.

ZI/z'irz e .3568: fizz/6n 202 1 6 UNITED STATES Patented. May 2, 190a PATENT OFFICE.

WATCHMAKERS TOOL.

SPECIFICATION forming part of Letters Patent No. 788,881, dated May 2, 1905.

I Application filed February 8, 1905. Serial No. 244,708.

To all whom, it may concern.-

Be it known that I, GEORGE W. Bownns, of Waltham, county of Middlesex, State of Massachusetts, have invented an Improvement in W atchmakers Tools, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention has for its object to construct an appliance designed to be used by watch makers and repairers for the purpose of straightening the bentends of pivots in watch or clock movements. 1t frequently happens that the ends of these pivots become bent, particularly the pivots of the balance-wheel, and the skill of the maker or repairer is taxed to the utmost in trying to accurately repair them, so as to bring them into true alinement with the body of the shaft, and much time is consumed and the results attending his efforts are more or less unsatisfactory by reason of the lack of accuracy obtained.

In accordance with this invention a holder is provided for holding the wheel with the ends of its pivot-shaft fitted in bearings provided for them. The holes in said bearings extend entirely through them, so that the pivots will project through them. An engaging device is attached to the holder, which is adapted to be brought into engagement with the projecting end of one of the pivots and means employed in connection therewith for moving it toward and from the pivot, so as to exert thereon any degree of pressure which may be necessary to bend the pivot into true alinement with the body of the shaft.

Figure 1 shows in front elevation a watch makers appliance for truing pivots, taken on an enlarged scale. Fig. 2 is a plan view of the appliance shown in Fig. 1. Fig. 3 is an enlarged detail showing the bearing-plates for the pivot-shaft and the acting end of the engaging device, and Figs. 4 and 5 are side views of modified forms of engaging devices.

The holder comprises a pair of jaws a b, pivotally connected together at c, and means such, for instance, as a slotted plate engaged by a thumb-screw c for holding said jaws in fixed relative positions.

To the opposing face or end of each jaw (t and b a bearing-plate a. b is secured, each plate having a hole through it adapted to receive the end of the pivot-shaft (Z of one of the wheels of a watch or clock movement. The jaws are set so that the pivot will project through the bearing-plate b a short distance or a distance sufficient to include the out-of-true portion thereof.

An engaging device is provided which is adapted to bear upon the projecting end of said pivot. with any desired degree of pressure for the purpose of truing it, and, so far as I am aware, I am the iirst to provide an engaging device having this capability. Hence 1 do not desire to limit my invention to the particular construction of engaging device employed for accomplishing this result.

The engaging device (shown in Figs. 1 to 3) consists of a lever f, pivoted at a point intermediate its length, as at f", to a pair of ears f rising from a body portion which is formed as a tongue f which extends through a hole in the jaw b and which is rigidly secured therein by a set-screw f". One arm of said lever f has formed at its extremity a projection f or lip, which is adapted to engage the pivot. The other arm of said lever f has a threaded hole through it, which receives an adjustingscrew f, which by projecting through said arm and bearing upon the jaw will act to hold the opposite end of the lever in any position desired I To vary the position of the shaft-engaging end of the lever f, the adjusting-screw f will be turned, and by turning said screw any degree of pressure may be exerted upon the pivot and the out-oftrue end thereof will be pressed into true alinement with its body portion.

Referring to Fig. 4;, a modified form of engaging device is shown, consisting of a pivoted lever; but the screw f is locatcdat the opposite side of the pivot fof the lever f and its end turns in a threaded socket in the arm 6.

Referring to Fig. 5, another modified form of engaging device is shown, wherein ascrew 9 extends through a threaded hole in a bracket g attached to the arm Z), the end of said screw engaging the pivot.

These as well as other modified forms of engaging device, it is obvious, come within the spirit and scope of my invention, it being understood that I desire to broadly claim an engaging device having the capabilities herein set forth;

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an appliance for bending the ends of pivots in watch and clock movements, the combination of a holder having two shaft-supports, through one of which the end of the pivot projects, and an engaging device adapted to act upon the projecting pivot with any desired degree of pressure, and means for operating said engaging device, substantially as described.

2. In an appliance for bending the-ends of pivots in watch and clock movements, the combination with a pair of jaws having shaft bearing-plates, and means for holding said jaws in fixed relative positions, of an engaging device adapted to act upon the pivot with any desired degree of pressure, and means for operating said engaging device, substantially as described.

3. In an appliance for bending the ends of pivots in watch and clock movements, the combination of a pair of jaws having shaft bearing-plates, and means for holding said jaws in fixed relative positions, of a pivoted lever having a pivot-engaging end, and means for moving said lever to exert any degree of pressure desired on the pivot, substantially as described.

4. In an appliance for bending the ends of pivots in watch and clock movements, the combination of a pair of jaws having shaft bearing-plates, through one of which the end of the pivot projects, and means for holding said jaws in fixed relative positions, of an engaging device having a lip adapted to engage the projecting end portion of the pivot, and means for operating said engaging device, substantially as described.

In testimony whereof I h ave signed my name to this specificationin the presence of two subscribing witnesses.

GEORGE w. Bowen's.

Witnesses:

'B.'J. NOYES, H. B. DAVIS. 

